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First, researchers have argued that the British car park studies included in the meta-analysis cannot accurately control for the fact that CCTV was introduced simultaneously with a range of other security-related measures.It has been argued that problems of selection bias and endogeneity can be adressed by stronger research designs such as randomized controlled trials and natural experiments.In private sector CCTV surveillance technology is operated in a wide variety of establishments such as in industry/manufacturing, retailing, financial/insurance/banking, transportation and distribution, utilities/communications, health care, and hotels/motels.Experiments in the UK during the 1970s and 1980s, including outdoor CCTV in Bournemouth in 1985, led to several larger trial programs later that decade.

VCR technology became available in the 1970s, making it easier to record and erase information, and use of video surveillance became more common.

There are about 350 million surveillance cameras worldwide as of 2016. The growth of CCTV has been slowing in recent years. Very little is known about Vericon except it was advertised as not requiring a government permit.

The earliest video surveillance systems involved constant monitoring because there was no way to record and store information.

In October 2009, an "Internet Eyes" website was announced which would pay members of the public to view CCTV camera images from their homes and report any crimes they witnessed.

The site aimed to add "more eyes" to cameras which might be insufficiently monitored.

Our values are much stronger than this heinous and cowardly act of terrorism."Russian President Vladimir Putin meanwhile called for the world to unite in an "uncompromising battle against the forces of terror.""We decisively condemn this cruel and cynical crime against civilians," Putin stated.